Variation of thermocouples (+ - 2 ° C) and are under the same conditions

Hi, my English is not the best but I trust in your intuition and intelligence capacity.

Actually Im connecting many thermocouples (type J) in a DAQ 9213. I managed to take all measures (7 thermocouples) and also the thermocouples are calibrated. My problem is that the 3 thermocuples give me one 20 ° c (60F) and the other 4 give me 22 ° c = 71.6 ° F, and all the thermocouples are under the same environmental conditions.  The easy solution is to put an offset and compensate for the error but it is not a good solution.

Can someone tell me what is happening? I think it's wiring problem maybe the COM, but I've referenced the negative signal (low signal) to the COM, also tried not to referencing the negative signals to the commune, but the result is worse because the signals are going crazy.

Please help me, please!

Hi Jesus Hernandez

Also remember that the thermocouples have a positive and a negative side, so if you plug wrong temperature will be different and it will decrease rather than increase when something warmer so close.

Best regards

Julio Mena

Tags: NI Hardware

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